AXE telephone exchange

The AXE telephone exchange is a product line of circuit switched digital manufactured by , a Swedish telecom company.

The AXE is the digital successor to the AKE analogue telephone exchange and ARF/ARM family of . The design is modular with an APZ dual processor running in sync mode, an APT switching part and an APG I/O part. It is used to connect local , operate mobile networks (, , , , ), international telephony traffic and signalling.

The brain of the AXE system is a dual processor system called APZ. It runs in making it fault redundant. The family of APZs started with APZ 210 04 back in 1976 and the latest one is APZ 212 55.

The core of the switching part was the Group Switch, initially a time-space-time multiplexer capable of switching up to 64K positions or connections. This Group Switch later evolved to a Distributed Group Switch using Time-Space switching technique with a maximum capacity of 512K.

the axe-based nodes in ericsson's GSM systems are:

MSC/VLR;

GMSC;

HLR;

ILR;

SSP;

SCP;

TRC;

BSC;

Two types of structure for AXE:

1.non-application modularity based axe systems:

axe=apt+apz

apt is the switching and telecommunications app. part of axe.

apz is the control or operating system part of axe. it is responsible for operating system functions, i/o functions ,service functions, etc.

2.application modularity based axe systems:

axe=am+rmp+xss+apz

xss: existing source system, is an apt. it is divided into: core apt and 1/apt;

rmp: resource module platform co-ordinates the system for the applicaton modules (am).

am: application modules is used to model and implement application oriented functions.

TELECOMMUNICATIONS APP. AXE SUBSYSTEMS:

TCS:TRAFFIC CONTROL SUBSYSTEMS;

TSS:TRUNK AND SIGNALING SUBSYSTEMS;

CCS:COMMON CHANNEL SIGNALING SUBSYSTEMS;

GSS: GROUP SWITCHING SUBSYSTEMS;

CHS: CHARGING SUBSYSTEMS;

OMS: OPERATION AND MAINTENANCE SUBSYSTEMS;

NMS: NETWORK MANAGEMENT SUBSYSTEMS;

STS: STATIC AND TRAFFIC MEASUREMENT SUBSYSTEM:

APZ is composed of:

CPS: CENTRAL PROCESSOR SUBSYSTEM; CPS contains 2 central processors which operate in an executive/stand-by relationship;

MAS: MAINTANCE SUBSYSTEM;

RPS: REGIONAL PROCESSOR SUBSYSTEM; the hardware is in the form of regional processors, while the software consists of administrative programs located in the rps.

SPS:SUPPORT PROCESSOR SUBSYSTEM;

FMS: FILE MANAGEMENT SUBSYSTEM;

MCS: MAN-MACHINE COMMUNICATION SUBSYSTEM;

DCS:DATA COMMUNICATION SUBSYSTEM;